activate application "System Preferences"

tell application "System Events"
	tell process "System Preferences"
		delay 2
		click the menu item "Keyboard & Mouse" of the menu "View" of menu bar 1
		delay 2
		click the radio button "Mouse" of the first tab group of the window "Keyboard & Mouse"
		click radio button "Left" of the first radio group of the first tab group of the window "Keyboard & Mouse"
	end tell
end tell

tell application "System Preferences"
	quit
end tell